Exception: System.ServiceModel.ServiceActivationException: The service ‘/EWS/exchange.asmx’ cannot be activated due to an exception during compilation. The exception message is: This collection already contains an address with scheme http. There can be at most one address per scheme in this collection.

Parameter name: item. —> System.ArgumentException: This collection already contains an address with scheme http. There can be at most one address per scheme in this collection.